This paper focuses on the performance-based seismic design (PBSD) methodology of multi-story concentrically braced frames (CBFs) equipped with a novel brace, i.e., the shape memory alloy (SMA)-friction damping brace (SMAFDB). The fundamental response characteristics of the framing structure are first understood through nonlinear response history analysis on the equivalent single-degree-of-freedom (SDOF) systems. The parameters varied in the SDOF analyses are the period of vibration (T), the strength reduction factor (R), and the normalized friction slip displacement (μ_f). The seismic response indexes of interest are the peak displacement, the ductility, the residual displacement and the peak acceleration. Relationships are built between the seismic response indexes and parameters of T, R and μ_f. Then, the SDOF-based results are explored to develop the PBSD methodology, which defines the peak interstory drift, the peak floor acceleration and the residual interstory drift as the performance targets. To demonstrate and validate the proposed design methodology, the six-story prototype CBFs equipped with SMAFDBs are designed and then subjected to ground motions associated with hazard levels of design basis earthquakes (DBE) and maximum considered earthquakes (MCE). The performance evaluation results indicate that the frames can be effectively designed to meet the targeted performance objectives at the DBE level. It also indicates that the frames maintain seismic-resisting capacity at the MCE level.

本文着重于多层基于同心支撑框架（CBF）的基于性能的抗震设计（PBSD）方法，该框架配有新型支撑，即形状记忆合金（SMA）摩擦阻尼支撑（SMAFDB）。首先通过等效单自由度（SDOF）系统上的非线性响应历史分析来了解框架结构的基本响应特性。在单自由度的分析而变化的参数是振动周期（Ť）时，强度降低系数（[R ），和归一化的摩擦滑动位移（μ _˚F）。感兴趣的地震响应指标是峰值位移，延性，残余位移和峰值加速度。关系的地震响应指标和参数之间建立Ť，- [R和μ _˚F。然后，探索基于SDOF的结果以开发PBSD方法，该方法将峰值层间漂移，峰值底加速度和剩余层间漂移定义为性能目标。为了演示和验证所提出的设计方法，设计了配备SMAFDB的六层原型CBF，然后使其经受与设计基准地震（DBE）和最大考虑地震（MCE）的危害水平相关的地震动。性能评估结果表明，可以有效地设计框架，以满足DBE级别的目标性能目标。这也表明框架在MCE级别上保持抗震能力。